I loved Tang as a kid. Mainly because you could control the concentration.
Some of that list is a bit "meh" though. Yeah, they might have been invented in the 60s, or hit their peak of popularity then, if that's all what the list is supposed to be about, but several of the brands are still going pretty strong.
Zero bars, just saw a whole rack of them at Walmart this morning.
Mallow cups, not a big player, but they still are sold, and don't seem to be that "retro", "oddball", or "boutique".
Sweet Tarts seem to be a pretty mainstream brand still.
Bit-O-Honey is getting there in what I'm thinking of in terms of relative obscurity. Stuff like the Teaberry gum (Cracker Barrel had some in their gift shop of all places...) or the Pillsbury space-sticks, where you have to go to one of those "Whatever happened to X candy?" websites is what I'd like to see.
Hell, even those nasty flavorless rainbow candy dots stuck to the paper, and the nasty wax bottles with the syrup in them are still sold in the novelty/generic candy rack at lots of grocery and drug stores.